An anonymous reader writes: Pundits tell us that the world of console video gaming is in dire straits, but recent collections of console video games have sold on eBay for tens of thousands of dollars. There are still a lot of video game disks and cartridges out there, but is it worth your effort to try to complete your collection and sell it on eBay? If you're a potential buyer for a massive collection of video games, are they likely to appreciate over time, or is this a really bad investment? Market research company Terapeak runs some numbers and suggests that it depends on your goals, the size and quality of your collection, and the console you're focused on.